At the Bird Town Summit, Mary Ellen from Schuylkill Township Bird Town handed out redbud pods. Here's the propagation information she also shared via email. Good luck! (Scarifying can be done by rubbing a small file over the seed coat.)

Eastern Redbud Tree Information from
Seed collection:
Eastern redbud fruits are pods. The pods can be collected in fall and winter after the pods
turn from green to dark brown.
Seeds are removed by peeling apart the pods around the seeds.
Discard misshapen, off-colored seeds, or seeds with small holes that may indicate the
presence of seed weevils.
Seeds can be stored dry for long periods in the refrigerator.

Seed dormancy:
Redbud seeds have combinational dormancy. This means that they have both physical
and physiological dormancy.

Seed germination:
Scarify seeds to break physical dormancy and allow water uptake.
Stratify seeds using moist chilling for 60 days to satisfy physiological dormancy.
Following stratification, sow seeds in a nursery container to produce a seedling or sow
them in a plastic container in the classroom to observe germination.